yeah . as you can see from the chart , in harmonic it gave you a buulish bat at the beginning then it act against and go up as a bearish bat .this will make you act late as you are waiting for confirmation of B .

If you had of got long at the D leg completion of the bullish bat, then you would have taken target 1 & target 2 before the D leg completion of the bearish bat.
At no point would you have a long and short position at the same time.